SpecFunc_RegularizedIncompleteGammaInverse

SpecFunc_RegularizedIncompleteGammaInverse(a, x, tail=False)

Inverse of the regularized incomplete Gamma function.

\forall x \in \Rset, \quad
RegularizedIncompleteGammaInverse(a, x) = \mathrm{P}^{-1}(a, x)

Parameters:

a : float \in \Rset^*_+

x : float \in [0, 1]

tail : bool, optional

By default, tail is False.

Returns:

result : float

  • If tail is False: result = \mathrm{P}^{-1}(a, x).
  • If tail is True: result = \mathrm{P}^{-1}(a, 1-x).